The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 2004
Filed:
Sep. 03, 1999
Applicant:
Inventors:
Uwe Numrich, Weiterstadt, DE;
Michael Wicker, See-heim-Jugenheim, DE;
Klaus Albrecht, Mainz, DE;
Heinz Vetter, Rossdorf, DE;
Hermann Jaksch, Ober-Ramstadt, DE;
Ernst Mohr, Lorsch, DE;
Assignee:
Roehm GmbH & Co. KG, Darmstadt, DE;
Primary Examiner:
Int. Cl.
CPC ...
C08K 3/32 ; C08L 3/312 ;
U.S. Cl.
CPC ...
C08K 3/32 ; C08L 3/312 ;
Abstract
Products based on polymethylmethacrylate (PMMA) so resistant to yellowing and so highly transparent that even the edges of plates produced from this material have a neutral colour, i.e. do not display any yellow tone. This effect is obtained by the admixture of 5 to 50 ppm inorganic, reducing phosphorus compounds after polymerisation. This enables the brightener content to be reduced under 10 ppb, and so the end product may also be used in contact with foodstuffs.